Reference9:PBX/Objects/External UC

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The External UC object is used to out-source presence information service. The presence information can be interrogated by other endpoints. The PBX delegates presence subscriptions to this External UC as well as presence publish events.

Out-sourcing can be requested on a per user basis. Every user object has an "External UC" attribute which delegates presence to the named External UC object.

Attributes

Subscribe
To synchronize the presence status of the users to the external source a Resource List subscribtion according to RFC 5367 is done, to avoid a presence subscription for each single user. This field is used to identify the list of users on the external system. It depends on the implementation on the external system. It may be a group name or some reserved word like 'all-users'.
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